Boom Hose Replacement - JLG Lull 1044C-54 II Series Service Manual

Boom Hose Replacement

31200079
7. Make sure the service ovals are lined up on the side rear of boom. If
not, adjust forward middle boom section first. Tighten the extend chain
to move the forward middle boom forward, or tighten the retract chain
to move the forward middle boom towards the rear. recheck chain
tension.
8. Then adjust the inner boom, retract the boom all the way and check the
clearance at the gooseneck. Adjust as needed
Note: If boom is too far to the rear, the gooseneck can hit the slide pad retainers.
WARNING: Fall Hazard. Use extreme caution when checking items
beyond your normal reach. Use an approved ladder. Failure to
comply could result in death or serious injury.
1. Lower both outriggers completely.
2. Remove the cover from the rear of the outer boom.
3. Loosen the tube clamps at the front and rear of the inner boom.
4. Remove hoses from tubes. From the rear of the boom, pull the
disconnected hose ends off the hose sheaves and out the rear of the
boom.
WARNING: Escaping hydraulic fluid under pressure can penetrate the
skin causing death or serious injury. Relieve hydraulic
pressure before serving any hydraulic component.
5. Extend the boom to the letter "C" to gain access to remove hose
sheave pins through rear boom service access. Remove the hose
sheave pins left and right. Then remove the hose sheaves.
WARNING: DO NOT perform service or maintenance on the vehicle with
the engine running, with the exception of the transmission
level check. Contact with moving parts can cause death or
serious personal injury.
6. Connect new hoses to the old hoses at the rear of the boom.
7. Extend the boom until you can remove the first tube clamp on the rear
middle boom.
8. Remove bolts that secure the manifolds to the boom and remove
hoses from the manifolds. (For machines with 2nd aux. hydraulic lines,
you will have to remove the tubes from the manifold to remove the
hoses).
9. Pull the new hoses into the boom and secure the hoses and or the
tubes to the manifolds. Then reconnect the manifolds to the boom.
10. Reinstall the tube clamps to the rear middle boom and retract the
boom to position the hose sheave pins for reinstallation from the rear
service access.
Boom and Transfer
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